UPDATE: Acquired some blank Blu-Ray cases and printable discs, i got a friend who has an Epson Artisan printer for printing on discs similar to Mr. Yotsuya’s, but I have no idea if the printable cover provided here fits the dimensions of my Blu-Ray case. Its just a standard generic Blu-Ray case.
Specifically this one:
It’s going to take some measuring and some knowledge of DPI and print size. Some cases have different widths, 11m, 14mm. That will affect how the printed cover fits.